1 /* 2 * Copyright (C) 2015 Broadcom 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 */ 14 15 #include <linux/clk.h> 16 #include <linux/clk-provider.h> 17 #include <linux/clk/bcm2835.h> 18 #include <linux/module.h> 19 #include <linux/platform_device.h> 20 #include <dt-bindings/clock/bcm2835-aux.h> 21 22 #define BCM2835_AUXIRQ 0x00 23 #define BCM2835_AUXENB 0x04 24 25 static int bcm2835_aux_clk_probe(struct platform_device *pdev) 26 { 27 struct device *dev = &pdev->dev; 28 struct clk_onecell_data *onecell; 29 const char *parent; 30 struct clk *parent_clk; 31 struct resource *res; 32 void __iomem *reg, *gate; 33 34 parent_clk = devm_clk_get(dev, NULL); 35 if (IS_ERR(parent_clk)) 36 return PTR_ERR(parent_clk); 37 parent = __clk_get_name(parent_clk); 38 39 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 40 reg = devm_ioremap_resource(dev, res); 41 if (!reg) 42 return -ENODEV; 43 44 onecell = devm_kmalloc(dev, sizeof(*onecell), GFP_KERNEL); 45 if (!onecell) 46 return -ENOMEM; 47 onecell->clk_num = BCM2835_AUX_CLOCK_COUNT; 48 onecell->clks = devm_kcalloc(dev, BCM2835_AUX_CLOCK_COUNT, 49 sizeof(*onecell->clks), GFP_KERNEL); 50 if (!onecell->clks) 51 return -ENOMEM; 52 53 gate = reg + BCM2835_AUXENB; 54 onecell->clks[BCM2835_AUX_CLOCK_UART] = 55 clk_register_gate(dev, "aux_uart", parent, 0, gate, 0, 0, NULL); 56 57 onecell->clks[BCM2835_AUX_CLOCK_SPI1] = 58 clk_register_gate(dev, "aux_spi1", parent, 0, gate, 1, 0, NULL); 59 60 onecell->clks[BCM2835_AUX_CLOCK_SPI2] = 61 clk_register_gate(dev, "aux_spi2", parent, 0, gate, 2, 0, NULL); 62 63 of_clk_add_provider(pdev->dev.of_node, of_clk_src_onecell_get, onecell); 64 65 return 0; 66 } 67 68 static const struct of_device_id bcm2835_aux_clk_of_match[] = { 69 { .compatible = "brcm,bcm2835-aux", }, 70 {}, 71 }; 72 MODULE_DEVICE_TABLE(of, bcm2835_aux_clk_of_match); 73 74 static struct platform_driver bcm2835_aux_clk_driver = { 75 .driver = { 76 .name = "bcm2835-aux-clk", 77 .of_match_table = bcm2835_aux_clk_of_match, 78 }, 79 .probe = bcm2835_aux_clk_probe, 80 }; 81 builtin_platform_driver(bcm2835_aux_clk_driver); 82 83 MODULE_AUTHOR("Eric Anholt <eric@anholt.net>"); 84 MODULE_DESCRIPTION("BCM2835 auxiliary peripheral clock driver"); 85 MODULE_LICENSE("GPL v2"); 86